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Avoiding blotchiness in high ISO B&W conversions

Small sensor cameras often produce coarse, blotchy color noise in high ISO images. When converting these color files to B&W, the result frequently takes on a mottled appearance. I've found two ways to get around it, but neither way is perfect. The first is by finding a particular mix of color channels (or using the B&W tool in Photoshop/ACR) to eliminate the difference between the blotchy areas, and the areas that surround them. This can be effective, but often the results remain somewhat mottled. The other way is to use a combination of color NR in C1 v4 and coarse detail NR in Noise Ninja. This is effective in removing color blotchiness prior to B&W conversion, but the C1 color NR takes a real toll on overall detail and color fidelity. Compared to ACR/Lightroom color NR, C1 color NR is somewhat of a sledgehammer as the following GX100 ISO 800 example shows:

How are others dealing with this issue? Have you found any RAW apps that effectively deal with this issue for high ISO conversions to B&W?